Hadith 3:498

Narrated 'Abdur-Rahman bin 'Auf:

I got an agreement written between me and Umaiya bin Khalaf that
Umaiya would look after my property (or family) in Mecca and I would
look after his in Medina. When I mentioned the word 'Ar-Rahman' in the
documents, Umaiya said, "I do not know 'Ar-Rahman.' Write down to me
your name, (with which you called yourself) in the Pre-lslamic Period
of Ignorance." So, I wrote my name ' 'Abdu 'Amr'. On the day (of the
battle) of Badr, when all the people went to sleep, I went up the hill
to protect him. Bilal(1) saw him (i.e. Umaiya) and went to a gathering
of Ansar and said, "(Here is) Umaiya bin Khalaf! Woe to me if he
escapes!" So, a group of Ansar went out with Bilal to follow us
('Abdur-Rahman and Umaiya). Being afraid that they would catch us, I
left Umaiya's son for them to keep them busy but the Ansar killed the
son and insisted on following us. Umaiya was a fat man, and when they
approached us, I told him to kneel down, and he knelt, and I laid
myself on him to protect him, but the Ansar killed him by passing
their swords underneath me, and one of them injured my foot with his
sword. (The sub narrator said, " 'Abdur-Rahman used to show us the
trace of the wound on the back of his foot.")